Pez lets you create a simple, fixed-size window and render to it with OpenGL. It's composed of a single header file and single C99 source file.
It's intended for creating small demos on Linux. If you're building a real application, you should probably use a real library like SDL or GLFW.
Your OpenGL demo needs to implement a few functions:
PezConfig PezInitialize() // One-time setup, return a small struct with window size & title
void PezRender() // Do your drawing here!
void PezUpdate(float elapsedSeconds) // Perform animation and physics
You can also optionally implement the following handler functions, depending on which #define statements you've got enabled in the header file:
void PezHandleMouse(int x, int y, int action) // Respond to a mouse click or move event
void PezReceiveDrop(const char* filename) // Respond to a file being drag-n-dropped to your window
Pez provides some utility functions to help make assertions with printf-style error messages:
void pezFatal(const char* pStr, ...)
void pezCheck(int condition, ...)
void pezPrintString(const char* pStr, ...)
Note that your job is to implement functions that are prefixed with a capital Pez, whereas functions that prefixed with a lowercase pez are already implemented for you.
Pez provides some OS-specific functions for you:
const char* pezOpenFileDialog()
const char* pezGetDesktopFolder()
int pezIsPressing(char key)
Pez never makes any OpenGL calls (that's up to you), but it provides a few helper functions to make it easy to load GLSL strings:
const char* pezGetShader(const char* effectKey)
int pezAddDirective(const char* token, const char* directive)
Take a look at glsw to see how the above functions work. pez also makes it easy to create vertex buffer objects from blobs of data:
PezVerts pezLoadVerts(const char* filename)
PezVerts pezGenQuad(float left, float top, float right, float bottom)
void pezFreeVerts(PezVerts verts)
void pezSaveVerts(PezVerts verts, const char* filename)
Likewise, here are some functions to help with textures or pixel buffer objects:
PezPixels pezLoadPixels(const char* filename)
void pezFreePixels(PezPixels pixels)
void pezSavePixels(PezPixels pixels, const char* filename)
void pezRenderText(PezPixels pixels, const char* message)
PezPixels pezGenNoise(PezPixels desc, float alpha, float beta, int n)